121621822803 has 24 divisors (see below), whose sum is σ = 189385324128. Its totient is φ = 74766730752.

The previous prime is 121621822801. The next prime is 121621822831. The reversal of 121621822803 is 308228126121.

It is a happy number.

121621822803 is a `hidden beast` number, since 1 + 2 + 1 + 621 + 8 + 2 + 28 + 0 + 3 = 666.

It is not a de Polignac number, because 121621822803 - 2¹ = 121621822801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121621822801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 424350 + ... + 650627.

It is an arithmetic number, because the mean of its divisors is an integer number (7891055172).

Almost surely, 2^121621822803 is an apocalyptic number.

121621822803 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121621822803 is a deficient number, since it is larger than the sum of its proper divisors (67763501325).

121621822803 is a wasteful number, since it uses less digits than its factorization.

121621822803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075963 (or 1075960 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

Adding to 121621822803 its reverse (308228126121), we get a palindrome (429849948924).

The spelling of 121621822803 in words is "one hundred twenty-one billion, six hundred twenty-one million, eight hundred twenty-two thousand, eight hundred three".